I'm thinking of switching to synthetic oil (amsoil 0 - 40) in March. I have heard that petroleum oil residue in engine and front gear case takes away from the synthetic oil heat transfer and slickness. I have a P650 with 1100 miles on it.

Should the engine and gear case be flushed with a solvent to get rid of varnish, etc.? If I do flush it, could it damage or screw it up someway? What would be a good solvent to use?

[img]i/expressions/face-icon-small-confused.gif[/img]

Just replace with the synthetic and leave it at that, will work its way out on its own!

I would avoid trying to rinse out the case with anything. A solvent could damage seals and you may end up clogging the screen instead of filtering through the filter.

Like Haymaker said, just make the switch.

Peace,
Sgt_Rock

Synthetic oil and conventional oil are totally compatable with each other. No need to flush out anything. Id check the owners manual, and see if 0-40 is recommended, before putting it in.

kawiyowee,
I'd just run it without flushing......
I'm just finishing a rebuild of my mohave engine: 380 cams, ss oversized valves, HD valve springs with titanium clips, hardened rockers, new wiseco piston, etc....You should have no problem with the Amsoil. I'm also going to the 0W-40 to break it in, etc.

oil is a natural cleaner, just change the oil you will be fine. you are heading in the right direction with the oil.